Brown coloring-matter.



UNITED STATES mim'rn. KAHN,

PATENT OFFICE.

F ELBERFELD, GERMANY, ASSIGNOR T0 FARBENFABRIKEN VORM.

FBIEDR. BAYER & 00., OF ELBERFELFD, GERMANY, A CORPORATION OF GERMANY.

BROWN COLCRING-MATTER.

No Drawing.

in Brown Coloring-Matter, of which the following is a specification.

plete after a short time.

My invention relates to the manufacture" and production of new browndisazo dyestuffs which can be obtained by combining the tetrazocompounds of meta-diaminodiphenylurea' with one molecule of ametaaminophenol sulfonic acid and with one moleculeof any other azodyestufi component. The dyes thus obtained are in the shape of theiralkaline salts brown powders soluble in water with a brown color; uponreduction with stannous chlorid and hydrochloric acid they aredecomposed, carbonic acid, metaphenylenediamin, diaminophenol 'sulfonicacid and an amin being obtained. They are valuable brown substantivedyestuffs, which possess an extraordinary ailinity for cotton. They canbe developed after dyeing with diazotized para-nitranilin. In this wayvery full brown shades are obtained, which can be discharged a splendidwhite with discharging agents. The fastness to washing of these shadesis very good. In order to illustrate the new process more fully thefollowing example given, the parts being b weight 2&2 parts ofmeta-diaminodi heny urea are dissolved in 1200 parts 0 water and 100parts of a 30 per cent. hydrochloricacid. It is then diazotized in theusual manner with a solution of 14 parts of sodium nitrate in 500 partsof water. A solution ofv 18.9 parts of meta-aminophenol sulfonic acid(XII, :QH :SO,H:1 :3 :6) in water is quickly added which solutioncontains an excess of sodium carbonate. The intermediate. compoundseparates out. Its formation is coinaqueous solution of '11 parts ofresorcin is added to the mass of the reaction which is then stirred forabout 1012 hours. dye is salted out, filtered off and dried. It

is, after being dried and pulverized, in the shape of it's sodium salt abrown powder soluble in hot water with a yellowish-brown Specificationof Letters Patent.

Subsequently an The Patented Jan. 11, 1910.

Application filed May 18, 1909. Serial No. 496,843.

l color duction with stannous chlorid and hydroacid,meta-phenylenediamin, diaminophenol sulfonic acid and aminoresorcin. Itdyes cotton brown shades which after combina-' tion with diazotizedpara-nitranilin' on the fiber change into yellowishbrown shades fasttowashing and leaving after being discharged a'pure white.

The process is carried out in an analogous manner on using other of theabove mentioned components, 0. g. another meta-aminophenol sulfonic acidsuch as the metaaminophenol disulfonic 3 acid '(NH OH: SO,H.:SOH:1:3:4:6), or other second components such as meta-aminophenol, chlorometa phenylenediamin (NH NII Cl:'1:3:4=), meta-toluylenediamin,metaphenylenediamin etc.

I claim:

' '1. The herein-described new disazo dyestuffs obtainable fromphenylurea, a meta-aminophenol sulfonic acid and a suitable azodyestuif-component, which dyestuffs are, after being dried andpulverized in the shape of their alkaline salts brown powders soluble inhot water with a brown color; yielding upon reduction with stannouschlorid and hydrochloric acid carbonic acid, meta-phenylenediamin,diaminophenol sulfonic acid and an amin; and-dyeing cotton brown shades,which a tter being developed on the fiber with diazotizedpara-nitranilin are fast to washing, leaving after being discharged apure White. substantially as described.

2. The herein-described new disazo dyestufl obtainable frommeta-diaminodiphenylurea, meta-aminophenol sulfonic acid and resorcin,which dyestutl is, after being dried and pulverized, in the shape of itssodium salt a brown powder soluble in hot water with a yellowish-browncolor and 501- able in concentrated sulfuric acid witi abrownish-redcolor; yielding upon reoucacid carbonic acid, metaphenylenediamix diammophenol sulfonlc acid and enamorechloric acid thedye is split up into carbonic,

and soluble in concentrated sulfuri acid with a yellowis i-brown color;upon remeta diaminodiso I tion with stannous chlorid and hydrochltriceorcin; and dyeing. cotton brown shades, my hand in the presence of twosubscribing which after being developed on the fiber wltnesses. mthdmzotlzed pera-nitranilin change into ellowish-brown shades fast towashing and MYRTIL KAHN' caving after being dischar ed a ure whiteWitnesses:

substantially as described. p t O'mo Kome, In teetunony whereof I havehereunto set x C. J. WRIGHT. I

' It is hereby certified that in Letters Patent No. 946,052, grantedJanuary 11, 1910, dpon the application of Myrtil Kuhn, of Elberfeld,Germany, for an improvement in Brown Coloring-Matter, an error appearsin the printed specification reqniring correction aa-follows: Page 1,line 37, the word nitrate should read nitfite, and that the said Letterswn: should be read with this correction therei that the same may conformto the record of the case in the Patent Oflice.

Signed and sealed this'Sth day of March, A. 1)., 1910.

[sun] v c. c. BILLLNGS,

7 Acting Commissioner of Patents.

eorcin; and dyeing. cotton brown shades, my hand in the presence of twosubscribing which after being developed on the fiber wltnesses. mthdmzotlzed pera-nitranilin change into ellowish-brown shades fast towashing and MYRTIL KAHN' caving after being dischar ed a ure whiteWitnesses:

substantially as described. p t O'mo Kome, In teetunony whereof I havehereunto set x C. J. WRIGHT. I

' It is hereby certified that in Letters Patent No. 946,052, grantedJanuary 11, 1910, dpon the application of Myrtil Kuhn, of Elberfeld,Germany, for an improvement in Brown Coloring-Matter, an error appearsin the printed specification reqniring correction aa-follows: Page 1,line 37, the word nitrate should read nitfite, and that the said Letterswn: should be read with this correction therei that the same may conformto the record of the case in the Patent Oflice.

Signed and sealed this'Sth day of March, A. 1)., 1910.

[sun] v c. c. BILLLNGS,

7 Acting Commissioner of Patents.

It is hereby certified that in Letters Patent No. 946,052, grantedJanuary 11, 1910, upon the application of Myrtii Kuhn, of Elberfeld,Germany, for an improvement in Brown Ooloring-Matter, an error appearsin the printed specification requiring correction as follows: Page 1,line 37, the word nitrate should read nitrite; and that the saidLetters' Patent should be read with this correction therein that thesame may conform to thp record of the case in the Patent Oflice.

Signed and sealed this 8th day of March, A. D., 1910.

C. C. BILLLNGS,

Acting Commissioner of Patents.

